Hi group!
I am a lurker at best here, but today I saw something that really
puzzled me. While I was looking at a trace file I noticed something
unusual about the ttl values for RIP updates on a PacketEngines switch.
This switch is connected to a Cat5000 and I had a sniffer in between the
two.
My understanding of RIP is that the ttl value = 2 and that it is
decremented as it enters a switch/router and then it is looked at.
Therefore, a ttl=2 would become ttl=1 before the packet is even looked
at. If the ttl=1 it would become ttl=0 and then, instead of being
looked at, it would be discarded. Is this correct?
First, let me say that the Packet Engines 2200 switch is a very good box
and it is communicating well with the Cat5k. The RIP updates are being
handled well by both sides, but; when looking at the sniff, the ttl
value from the packet Engines box is set to =1. How can this be?
Do I totally misunderstand the UDP ttl value in relationship to RIP?
Any insights would be helpful. BTW, I have got a call into a
PacketEngines s/w engineer and am waiting for a response.
Thanks,
Lance
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